What is the fourth dimension in a 'Tesseract Cube' in geometry?

Dear Student,

Tesseract Cube is a hyper cube of 4th dimension. Tesseract is a mathematical construct. It is a description of what a higher dimensional object would look like if such higher dimensions existed. Secondly, how do you conclude that you do not have such objects popping out of the 4th dimension, if it existed? You must remember that the world that you and I can see need not be the entire story. It may be true that higher dimensions exist but we can't access it. That is a totally logical possibility.

For instance, imagine an ant walking on a piece of paper. As far as the ant is concerned, it knows only of the 2 dimensions of the paper. Does that mean that the 3rd dimension that it cannot see doesn't exist? No! It simply means that the ant can only see and make sense of objects living on the paper or projections of three-dimensional objects on that paper. If the ant were smart enough, by studying the properties of the projected objects, it could infer the existence of the 3rd dimension without ever having seen it. The same logic applies to us. We will never be able to directly see the 4th dimension, but imprints of its existence might be present in the 3 dimensions that we can see. 

It is not possible for us to see a tesseract in all its glory. What we can see is the projection of a tesseract on a 3d plane. Now, depending on which plane is chosen for the projection, the tesseract looks different.

The diagram on Wikipedia is trying to give you the best possible "view" of the tesseract by rotating the plane on which the projection is being done, thereby allowing you to see all possible projections of the tesseract.

In fact, the text below the picture clearly states this

A 3D projection of an 8-cell performing a
simple rotation about a plane which bisects
the figure from front-left to back-right and
top to bottom

A tesseract can be created by joining points like

Hope this information will clear your doubts about topic.

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